found this http://www.zevendevelopment.com/relayexpander.html I was looking to control 48 relays in sequential order with external controls for duration and frequency. How do I properly communicate to the boards? Sorry new to this setup.

  • Looks like you communicate via the IOExpander board. – Majenko Oct 8 '19 at 15:32
  • Their IO expander gets controlled via Serial (UART). From there all the relay expanders are controlled. Have you already bought these boards? – chrisl Oct 8 '19 at 15:32
  • I guess what I’m really saying is I’m not clear on how to properly code this. I have not bought these boards yet but they seem like the perfect solution. Would you recommend anything else? – TheDengo Oct 8 '19 at 15:36

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